Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s10265-014-0685-4 |
Productivity responses of desert vegetation to precipitation patterns across a rainfall gradient | |
Li, Fang1,2; Zhao, Wenzhi1,2![]() | |
通讯作者 | Zhao, Wenzhi |
来源期刊 | JOURNAL OF PLANT RESEARCH
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ISSN | 0918-9440 |
EISSN | 1618-0860 |
出版年 | 2015 |
卷号 | 128期号:2页码:283-294 |
英文摘要 | The influences of previous-year precipitation and episodic rainfall events on dryland plants and communities are poorly quantified in the temperate desert region of Northwest China. To evaluate the thresholds and lags in the response of aboveground net primary productivity (ANPP) to variability in rainfall pulses and seasonal precipitation along the precipitation-productivity gradient in three desert ecosystems with different precipitation regimes, we collected precipitation data from 2000 to 2012 in Shandan (SD), Linze (LZ) and Jiuquan (JQ) in northwestern China. Further, we extracted the corresponding MODIS Normalized Difference Vegetation Index (NDVI, a proxy for ANPP) datasets at 250 m spatial resolution. We then evaluated different desert ecosystems responses using statistical analysis, and a threshold-delay model (TDM). TDM is an integrative framework for analysis of plant growth, precipitation thresholds, and plant functional type strategies that capture the nonlinear nature of plant responses to rainfall pulses. Our results showed that: (1) the growing season NDVIINT (INT stands for time-integrated) was largely correlated with the warm season (spring/summer) at our mildly-arid desert ecosystem (SD). The arid ecosystem (LZ) exhibited a different response, and the growing season NDVIINT depended highly on the previous year’s fall/winter precipitation and ANPP. At the extremely arid site (JQ), the variability of growing season NDVIINT was equally correlated with the cool- and warm-season precipitation; (2) some parameters of threshold-delay differed among the three sites: while the response of NDVI to rainfall pulses began at about 5 mm for all the sites, the maximum thresholds in SD, LZ, and JQ were about 55, 35 and 30 mm respectively, increasing with an increase in mean annual precipitation. By and large, more previous year’s fall/winter precipitation, and large rainfall events, significantly enhanced the growth of desert vegetation, and desert ecosystems should be much more adaptive under likely future scenarios of increasing fall/winter precipitation and large rainfall events. These results highlight the inherent complexity in predicting how desert ecosystems will respond to future fluctuations in precipitation. |
英文关键词 | Aboveground net primary productivity Previous precipitation Rainfall events Temperate desert regions Threshold-delay model |
类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
收录类别 | SCI-E |
WOS记录号 | WOS:000350826000006 |
WOS关键词 | NORTHERN CHIHUAHUAN DESERT ; NET PRIMARY PRODUCTIVITY ; GAS-EXCHANGE ; PHOTOSYNTHETIC ACTIVITY ; EXTREME PRECIPITATION ; GRASSLAND ECOSYSTEM ; SEMIARID GRASSLAND ; SOIL RESPIRATION ; EVENT SIZE ; PULSES |
WOS类目 | Plant Sciences |
WOS研究方向 | Plant Sciences |
来源机构 | 中国科学院西北生态环境资源研究院 |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/188913 |
作者单位 | 1.Chinese Acad Sci, Linze Inland River Basin Res Stn, Key Lab Inland River Basin Ecohydrol Cold & Arid, Lanzhou 730000, Peoples R China; 2.Chinese Acad Sci, Engn Res Inst, Lanzhou 730000, Peoples R China |
推荐引用方式 GB/T 7714 | Li, Fang,Zhao, Wenzhi,Liu, Hu. Productivity responses of desert vegetation to precipitation patterns across a rainfall gradient[J]. 中国科学院西北生态环境资源研究院,2015,128(2):283-294. |
APA | Li, Fang,Zhao, Wenzhi,&Liu, Hu.(2015).Productivity responses of desert vegetation to precipitation patterns across a rainfall gradient.JOURNAL OF PLANT RESEARCH,128(2),283-294. |
MLA | Li, Fang,et al."Productivity responses of desert vegetation to precipitation patterns across a rainfall gradient".JOURNAL OF PLANT RESEARCH 128.2(2015):283-294. |
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